How Does Mobile Antenna Manufacturer Work?

What is a Cell Tower?

Cell towers, also known as cell sites, are where electric communications equipment and antennae are mounted, allowing the surrounding area to use wireless communication devices like telephones and radios. 

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Cell towers are usually built by a tower company or a wireless carrier when they expand their network coverage or capacity, providing a better reception signal in that area. Cell towers are basically everywhere across the United States, although some cities have more than others. And Millman Land was there since the late s, ensuring that the cell towers are all properly inspected. 

There are currently more than 307,000 cell towers in the United States. Sometimes they can be spotted on tops of buildings. Other times cities require cell towers to blend into the cityscape seamlessly. Rural areas sometimes hide them in treescapes, disguising them as a tree. 

Our wireless services include cell tower surveys, cell tower audits and As-builts. In this article, we aim to tell you more about cell towers and how they work. We also want to address people’s growing concerns over 5G and put to rest the rumors. 

How Do Cell Towers Work? 

There are over 300 million cell phones being used daily in the United States. Whenever a cell is used, it emits an electromagnetic radio wave, called a radio frequency, that is received by the nearest cell tower’s antenna. 

Once the cell tower receives this signal, it will transmit the signals to a switching center. This allows the call to be connected to either another mobile or to a network. It’s crazy to think all of this happens in mere seconds. 

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Parts of a Cell Tower

The insanely fast technology of a cell tower is due to its parts. You’ll hear us mentioning cell carriers a lot in this section. That’s because a lot of the parts of a cell tower are provided by individual cell carriers, also known as wireless networks. 

There are four wireless networks in the United States that have the best coverage. Right now the top provider is Verizon, which has 70% 4G coverage. AT&T is in close second with 68%. T-Mobile has 62% and Spring is in fourth with 27%, a major decline in coverage. 

The Tower

There are actually four different types of cell towers. The first kind is known as a lattice tower. Also called a self-supporting tower, this type of tower offers incredible flexibility. It usually has three or four sides with similar shaped bases. 

The second type of tower is a monopole tower. This type of tower features a single steel or concrete tube tower, usually under 50 meters. It only requires one foundation. The antennas are attached to the exterior. 

A guyed tower is cost-effective but requires a bigger amount of land. It’s usually built 100 meters or greater, connected buy guy wires to anchor and support it. They are attached to the ground in all directions. Most radio and television towers are guyed towers.  

The fourth type is the stealth tower, which we briefly touched upon before. Often required by councils, these are more expensive than the other three options but aim to beautify the community they’re in. They require additional materials that help them hide in plain sight. While much more appealing, they often do not provide the same amount of capacity for tenants. 

The Equipment

The equipment on cell towers includes transceivers and other supporting technology. These are installed in cabinets or shelters or any other way that wireless carriers choose to protect them. Some even create outdoor cabinets on concrete pads or prefabricated equipment shelters. 

The Antennas

Alright, we’ve touched on antennas a lot, but what are they? There are multiple antennas attached to a cell tower, typically mounted on a head frame. Some towers even have up to 15 antennas per carrier. This number really depends on the antenna’s performance, coverage and capacity requirements. 

Utilities and Access

Carriers will also install utilities at the cell tower site. Each carrier has power to run to the site as well as service. Each cell tower also requires access by the carriers for initial installation and ongoing maintenance.

Related: Cell Tower Effectiveness Guide

Cell Tower Range

The aforementioned parts help determine just how far a cell tower can be a from a cell while still able to pick up its signal. That distance is determined by the connecting technology, landscape features (hills, trees and buildings), the power of the tower’s transmitter, the size of the cellphone network and the network’s design capacity. 

What’s interesting is that a cell tower will sometimes have their transmitter seat to a lower power on purpose to ensure it doesn’t interfere with neighboring cells. 

But even with all of those factors, the typical cell tower can provide service up to 45 miles away. That’s quite impressive! Let’s take a closer look at what various components affect a cell tower’s range and effectiveness. 

What Affects a Cell Tower’s Range?

The range of a cell tower is not a fixed figure. That’s because there are so many variables when it comes to the range in which a cell tower connects a mobile device. The most common variables include:

• How hight the antenna is over the surrounding landscape.
• The frequency of the signal in use.
• The rated power of the transmitter.
• The directional characteristics of the antenna array on the site.
• Nearby buildings and vegetation absorbing and reflecting radio energy.
• The local geographical or regulatory factors and weather conditions.

Cell towers are often built in areas with high population densities. That’s because these cities have the most potential cell users. For that reason, you’ll often find cell towers “overlapping” in more crowded areas. This helps to avoid interference problems. 

If you find yourself wondering why you don’t have a signal on your cell , it could be because you’re too far from a tower or because the cell signal has been decreased by hills, large buildings or other structures. You may also lose your signal if a lot of people are attempting to use the cell tower at the same time. That often leads to calls getting dropped. 

While driving, your can switch from one cell tower to the next mid-conversation. As you continue your journey, the cell will pick the strongest signal and release the weaker cell tower, making it available to another caller. 

Another factor that could affect your signal is a problem with the cell tower. With help from surveyors like Millman National Land Service, these issues can be identified so they don’t turn into a major headache. 

What Are the Safety Standards for Cell Towers?

According to the Connecticut Department of Public Health, many standards are put in place to protect people around cell towers. For starters, the FCC sets strict limits on the amount of RF energy that cell antennas can give.

These limits factor in the potential unknowns regarding the effects of RF radiation on public health. In addition to these limits, cell towers are often restricted with fences and warning signs. That way, no one unintentionally comes into close contact with the transmitting antenna.

What Are Cells-On-Wheels?

When most people think of cell towers, they tend to picture permanent structures. However, that’s becoming a thing of the past thanks to cells-on-wheels (also humorously referred to as COWs). These portable structures can easily be towed into locations.

They are great for providing temporary cell service during a power outage. Or, if the equipment is damaged, it can be used until repairs have been made.

Is 5G Dangerous?

With the coronavirus pandemic continuing to strike fear into people all over the world, it’s no surprise that we’re seeing an abundance of conspiracy theories regarding COVID-19 and how it’s spread. One of the most bizarre are the Facebook posts claiming that 5G has created the coronavirus pandemic. While definitely a little on the radical side, there are still some health concerns about 5G that are a bit more grounded in science. 

But no: 5G did not cause the coronavirus. 

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What is 5G?

Big wireless carriers like AT&T, Verizon and Spring have started to implement 5G as the new wireless standard. In a year or so, 5G will be available throughout the United States. There are currently some devices that use 5G, like Samsung’s Galaxy S10, but most current models do not support 5G just yet. 

5G will basically be a major improvement on network performance. It’s considered a huge upgrade from 4G, which debuted back in . While 4G delivers 10 Mbps, 5G will deliver peak speeds between 10 and 20 Gbps. It’s also more ideal for video game streaming, downloading movies and other heavy-duty data activities since network latency will drop from 30ms to 1ms. 

While this is all exciting technology-wise, there are currently growing concerns over the health risks of 5G, since it’s a stronger radiofrequency. While 5G has not caused the coronavirus, are there other dangers lurking on cell towers across the United States?

Interested in implementing 5G into your next cell tower project? Visit this page to learn how Millman National Land Services can help you.

How Dangerous Is Radiofrequency Radiation?

So what are these Facebook conspiracy theorists claiming about 5G? There are growing concerns that 5G’s higher energy radiation will bring potentially damaging effects to human beings near the cell towers. This increase in radiofrequency radiation will supposedly lead to cancer, premature aging and disruption in cell metabolism thanks to damage done to human DNA. 

Is this true? 

Well, not to be an alarmist, but RFR can also be found in your microwave, radios and other daily activities and common household items. Even computer monitors. Because of this, it’s already been determined that RFR is not really all that dangerous unless used in certain circumstances. 

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What are these dangerous circumstances? Well, the radiation has to be “ionizing” to be strong enough to break chemical bonds. This includes x-rays and gamma rays. Wi-fi and FM radio are “non-ionizing,” meaning they’re too weak to cause any damage. Non-ionizing RFR, like those found coming from cell towers, have no known mechanism that causes biological effects or DNA mutations. In other words, it’s completely safe. 

The Risks of 5G

So 5G is a new technology – a stronger technology. Should people be concerned? Currently, 5G is a non-ionizing RFR, meaning it’s not able to do any real damage. 

Many conspiracy theories point towards the fact that 5G will require more transmitters. Since there are more popping up in cities, towns and neighborhoods, will the dose be higher? While a reasonable question to ask, 5G cell towers are still not a threat, even when there’s more cropping up. The electromagnetic radiation you withstand by walking outside is far greater than a 5G cell tower. 

But what about 5G’s higher gigahertz frequency? Since it’s higher, is it more dangerous to living organisms? Currently, there’s no science supporting this. The FCC has also stated that there are no health problems currently associated with cell towers. 

“For 5G equipment, the signals from commercial wireless transmitters are typically far below the RF exposure limits at any location that is accessible to the public,” said Neil Derek Grace, a communications officer at the FCC.

While scientists are continuing to look into 5G technology and possible health risks, there is currently nothing to support that 5G cell towers do real harm to humans or animals. 

The good news is that the FCC isn’t the only one who has declared 5G safe. According to this Forbes article, the World Health Organization and the FDA have proclaimed that this new technology poses no public health risk.

Related: Why Do Cell Signals Go Bad? What You Need To Know

What Is the Future of Cell Towers?

According to statistics, there are likely nearly half a million mobile wireless cell sites found in the United States. Now, a large number of new investments will be going toward transitioning these sites into 5G.

However, it’s important to note that we likely won’t see as many unique cell sites in the future. Why? Because many providers now want to recombine towers. 4G and 5G technologies allow cell providers to do this.

And it significantly decreases their operating expenses since they don’t need to operate and maintain unnecessary towers. So instead of more cell sites in the future, we’re more likely to see fewer.

How Millman National Land Service Can Help With Your Cell Towers

Our company has been on the front lines in helping telecommunication providers transition into 5G. We provide services like co-location cell site surveys that allow two telecom providers to use the same tower.

What’s more, we’ll take care of all the surveys that go into creating a new cell tower. Want to learn more about our telecommunication services?

If you’re ready to get all your surveying needs taken care of, then contact us today, and we’ll get started on your next project. 

Conclusion

As technology continues to advance, more and more cell towers will crop up around the United States. But as we await 5G technology, there are still over 307,000 cell towers around the nation that ensure we get cell service almost everywhere we go. It’s incredible what technology is behind these towers.

Our world is more connected than ever, and it takes a tremendous amount of resources to keep the networks we all rely on stable. Cell towers, also commonly referred to as cell sites or base transceiver stations, are crucial components of modern telecommunication systems. The physical structure holds necessary equipment for the transmission and reception of radio signals for a specific "cell" or area, hence the name. Cell towers facilitate wireless communication between mobile devices and the network. These structures play an indispensable role in the wireless communication ecosystem, enabling us to make calls, send texts, and access the internet from our mobile devices—and they require intensive testing.

By providing flexible, scalable, and cost-effective solutions for the testing of new, complex technologies, NI contributes significantly towards building reliable wireless infrastructures. As wireless technologies evolve and grow more intricate, particularly relevant with the advent of 6G, innovative solutions will help test engineers build an advanced understanding of the network design and test technology necessary to maintain cell tower uptime.

If you scan the horizon, it's almost certain you'll spot a cell tower, even if you don’t immediately recognize it. Base transceiver stations come in a wide variety of sizes from familiar tall towers to small units not much larger than a smoke detector. It all depends on the coverage needed and traffic density in the area.

But what does a cell tower look like? Cell towers resemble tall, vertical masts adorned with arrays of antennas, typically segmented into three or four directions, giving them a distinct, recognizable silhouette. However, not all cell towers stand out so clearly. Stealth towers are more covert, camouflaged within their environment, discreetly incorporated into existing structures such as rooftops or even church steeples. Whether they're immediately recognizable or subtly blended into their surroundings, these towering structures are packed with a range of critical equipment that ensures seamless cellular connectivity across the area they serve.

While each cell tower may be slightly different, depending on the needs of the network and the specific area it serves, these components are typically present in most installations:

• Antennas—These are crucial for transmitting and receiving signals to and from mobile devices within a specific cell. They come in two main cell tower antenna types:

             - Panel Antennas—These are flat, rectangular devices that serve a wide area. They are versatile and can be arranged in various configurations to achieve desired coverage and capacity. They can use MIMO (Multiple Input, Multiple Output) technology, which increases capacity by transmitting several data streams on the same channel.

             - Sector Antennas—Often grouped in threes or fours on a tower, sector antennas are designed to provide coverage in a specific direction or "sector." This segmentation effectively broadens the overall coverage area and reduces interference between signals. They're often arranged in a geometric configuration, providing 360-degree coverage.

• Base Transceiver Station (BTS) —The BTS houses the radio transceivers that receive and transmit RF signals. Each transceiver or channel supports a certain number of concurrent calls. The BTS also includes equipment for encrypting and decrypting communications, spectral filtering tools, duplexers, and amplifiers.

• Tower or Mast—This tall physical structure holds the antennas aloft and is typically made of steel. Its height is strategic: the higher the antennas, the broader the area they can cover. The structure must also be able to withstand environmental stressors like wind and weight load from the equipment.

• Ground-Based Equipment—This includes enclosures or shelters that house various auxiliary systems such as cell tower power systems (often battery backups for reliability), HVAC systems for temperature control, and baseband receivers used for processing call data.

• Microwave Dishes—For cell towers not connected with physical cable to the telecommunications network (usually in remote locations), microwave dishes are used for backhaul connections. These dishes facilitate point-to-point communication with other towers or a network node. They are often seen on the sides of the tower and are particularly useful in areas where it is impractical to run cables.

• Cabling—Cabling connects all the components of the cell tower, allowing them to communicate with each other. Cabling can include various types, such as coaxial cables, waveguides for microwave transmission, and fiber optic cables. RF cables run from the BTS to the antennas and network cables for data transmission.

The seamless orchestration of these cell tower components underpins the backbone of wireless communications networks.

Cell towers serve as the intermediary between mobile devices and the telecommunications network. In layman's terms, cell towers work by receiving signals from your mobile device, converting these signals into a digital format, and then sending them along to their destination, either to another or onto the internet. For incoming calls or data, the process is reversed. That process may sound simple, but it has many steps and pieces of equipment. Let’s get into the details.

The communication process begins when a mobile device, such as a cell , sends a signal. This signal is an electromagnetic wave, specifically a RF wave, which is essentially a modulated version of the user's voice or data. The signal is picked up by one of the antennas mounted on the mast. These antennas can use MIMO technology, transmitting multiple data streams on the same channel to increase capacity.

After the antenna receives the signal, it is passed through a series of high-frequency coaxial cables or waveguides to the BTS housed at the base of the tower. The BTS converts the RF signal into a digital format that can be processed by the network. The processed signal is then dispatched to the mobile switching center (MSC) through backhaul connections. Depending on the location and infrastructure, this connection could be physical, such as through fiber optic cables (for urban or suburban areas), or wireless like microwave links (for remote areas).

The MSC, the nerve center of a cellular network, then routes the call or data to the correct destination, which could be another mobile device or a server on the internet. For an incoming call or data, the process is essentially reversed. The MSC dispatches the signal to the BTS, which then upconverts it back to an RF signal. This RF signal is then transmitted by the tower's antennas to the intended mobile device.

A cell tower can send signals to phones up to 20 miles away in rural areas. In densely populated cities with many physical obstructions like buildings, the range might be reduced to a mile or two. Cell towers can handle thousands of calls or internet connections at the same time.

When looking at how far cell towers reach, the range, technically referred to as the cell radius, can be significantly impacted by several factors. High frequency signals, such as those typically used in 5G networks, tend to have shorter ranges but higher capacities, while lower frequencies, often used in rural areas for 4G LTE, can travel further but carry less data. The height and type of the antenna also play an integral role in determining the coverage. Higher antennas can overcome obstructions and cover a larger area. Antenna types such as sector antennas can be used to provide targeted coverage in specific directions, while panel antennas offer broad coverage. Beamforming, a technique used in advanced MIMO setups, can also be employed to focus the signal toward specific users to extend the range and improve signal quality.

To cover thousands of simultaneous requests, modern cell towers employ sophisticated technologies to maximize the number of concurrent calls or data sessions. MIMO allows for the simultaneous transmission and reception of multiple data streams, effectively multiplying the capacity without requiring additional bandwidth. Advanced spectral efficiency techniques, such as quadrature amplitude modulation (QAM), are also employed to transmit more bits per Hz of bandwidth. The specific technology used changes capacity. mmWave technology offers room for higher bandwidths which in turn can increase capacity significantly. Additionally, the range of frequencies allocated for cell use in a specific area, also known as the amount of available spectrum, can affect capacity.

In wireless communication, line of sight refers to the direct, unobstructed path that radio waves travel from the transmitting antenna, such as a cell tower, to the receiving antenna, which could be something like a smartphone.

For optimal signal strength and quality, a clear line of sight between the transmitter and receiver is important Obstructions like buildings, trees, hills, or even atmospheric conditions can cause signal attenuation, or weakening, and multipath propagation, where signals bounce off surfaces and arrive at the receiver at different times, potentially causing interference and degraded performance.

Line of sight becomes  especially important in higher frequency bands,like those used in 5G networks, which have shorter wavelengths and are more prone to be absorbed or reflected by obstacles. Line of sight is why you often see cell towers placed high above ground level and why technologies like beamforming are used to focus the radio signal in a specific direction towards the receiver.

The primary distinctions between 4G and 5G cell towers revolve around the changes in technology that affect the speed, capacity, and latency of the wireless network. 4G networks typically operate on lower frequency bands, up to 2.5 GHz, while 5G technology is designed to employ a wider spectrum, incorporating higher frequency bands up to 100 GHz. The use of these higher frequencies, particularly the millimeter-wave bands over 24 GHz, can facilitate faster network transmission, but with less range.

One of the most noteworthy differences is data transfer rates. 5G cell towers can deliver significantly higher data speeds than their 4G counterparts. To put this into perspective, while 4G LTE networks can provide peak speeds around 100 Mbps, 5G networks have the theoretical potential to deliver speeds up to 10 Gbps, a hundredfold increase.

Latency, or the delay in data transfer following an instruction for its transfer, is another area where 5G excels. Compared to the typical latency of around 50 milliseconds on 4G networks, 5G aims to reduce this to just a few milliseconds, which is particularly important for real-time applications, such as autonomous vehicles. 5G technology requires a higher density of cell towers, especially in areas of high population density or for indoor coverage, because of the shorter range of the higher frequencies. To solve this challenge, small cell towers are used to augment coverage and capacity.

Compared to 4G towers, 5G ones incorporate many more antennas on a single tower, known as Massive MIMO (Multiple Input Multiple Output), to enhance the capacity and efficiency of the network. They also utilize a technique called beamforming, which focuses the wireless signal in a specific direction rather than indiscriminately broadcasting in all directions like 4G cell towers. This approach helps improve cell tower signal strength and diminish interference.

Despite their differences, it's worth noting that 4G and 5G technologies aren't mutually exclusive. The majority of 5G networks share their backhaul and entire network structure with 4G, differing only in the wireless interface. These types of deployments are typically referred to as NSA (Non-Stand Alone) networks. The popularity of NSA networks is largely because all components, except for the base station, can be reused, thus reducing the cost of network construction. There are also stand-alone, or SA networks, which could potentially offer better capacity, but these necessitate building all network components from scratch, making them significantly more expensive to construct. As such, most devices can switch between 4G and 5G as required in NSA networks.

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